How to implement the "AsynchronousFileChannel newAsynchronousFileChannel" in sshd sftp?

[hooverhe]

I am using sshd-sftp 2.15.0. When we download a lot of large files concurrently, we are facing downloading neck with default implementation "FileChannel newFileChannel" in RootedFileSystemProvider. But I found the "AsynchronousFileChannel newAsynchronousFileChannel" function in it, too. I think maybe it has better performance. Right?

But the class FileHandle has the "SeekableByteChannel fileChannel" property, and it is calling the provider.newFileChannel(path, options, attrs) in FileHandle. And AsynchronousFileChannel does not implement SeekableByteChannel.

Can you give me some guides how to implement the "AsynchronousFileChannel newAsynchronousFileChannel" in sshd sftp? For downloading neck, do you have any suggestion? Thanks.